librsvg before 2.40.12 allows context-dependent attackers to cause a denial of service (infinite loop, stack consumption, and application crash) via cyclic references in an SVG document.
https://git.gnome.org/browse/librsvg/commit/?id=a51919f7e1ca9c535390a746fbf6e28c8402dc61
https://bugzilla.redhat.com/show_bug.cgi?id=1268243
http://www.openwall.com/lists/oss-security/2016/04/30/3